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1993 Toyota 4-Cylinder On-Vehicle Adjustments

September 19th, 2008 · No Comments

Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay.
VALVE CLEARANCE
NOTE: Adjust valve clearance with engine cold.
NOTE: If valve cover uses grommets below retaining nuts or bolts, keep grommets in order so they are installed in original locations during reassembly.
1) Remove valve cover(s) and gasket(s). Rotate crankshaft so timing mark on crankshaft pulley aligns with “0″ mark on front cover and cylinder No. 1 (front cylinder) is at TDC of compression stroke.
2) Ensure valves on cylinder No. 1 are closed. With cylinder No. 1 at TDC, check clearance on specified valves. See VALVE CLEARANCE ADJUSTMENT SEQUENCE
3) Using feeler gauge, measure and record clearance between valve lifter and camshaft. Ensure valve clearance is within
specification. See VALVE CLEARANCE SPECIFICATIONS table.
4) To check remaining valves, rotate crankshaft 360 degrees (one full revolution) until cylinder No. 4 is at TDC of compression stroke. Measure valve clearance on specified valves. See VALVE CLEARANCE ADJUSTMENT SEQUENCE table.
5) If valve clearance requires adjustment, rotate crankshaft so camshaft lobe on valve to be adjusted is facing upward, away from valve lifter. Rotate valve lifter so notch on valve lifter is toward spark plug.
6) Press valve lifter downward using Valve Clearance Adjuster (SST 09248-55020) and SST (A). See Fig. 2. Install SST (B) between camshaft and valve lifter. Remove SST (A).
7) Using small screwdriver and magnet, remove adjusting shim. Measure thickness of adjusting shim removed. Using measured clearance and adjusting shim thickness, determine correct thickness of adjusting shim to be used

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